LOCATION KUDLAC ID+UTEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, calcareous, mesic Xeric Torriorthents
TYPICAL PEDON: Kudlac silty clay--on a 15 percent south-facing slope under rangeland vegetation at 3,500 feet elevation. (Colors are for dry soil unless otherwise noted.) When described on August 18, l976 the soil profile was dry throughout.
A1--0 to 4 inches; light gray (10YR 7/2) silty clay, yellowish brown (10YR 5/4) moist; moderate very fine granular structure; slightly hard, friable, very sticky and very plastic; common fine roots; common fine vesicular pores; slightly effervescent (6 percent calcium carbonate); moderately alkaline (pH 8.2); abrupt smooth boundary. (2 to 6 inches thick)
A2--4 to 7 inches; light gray (10YR 7/2) clay, pale brown (10YR 6/3) moist; weak fine platy structure; slightly hard, friable, very sticky and very plastic; common very fine, fine and medium roots; common very fine tubular pores; slightly effervescent (6 percent calcium carbonate); few fine segregated lime filaments; moderately alkaline (pH 8.2); abrupt smooth boundary. (2 to 10 inches thick)
2Bk1--7 to 11 inches; pale brown (10YR 6/3) loam, brown (10YR 5/3) moist; massive; hard, firm, slightly sticky and slightly plastic; few very fine, fine, and medium roots; few very fine and fine tubular pores; strongly effervescent (8 percent calcium carbonate); many fine segregated lime filaments; moderately alkaline (pH 8.2); abrupt smooth boundary. (0 to 5 inches thick)
2Bk2--11 to 14 inches; brown (10YR 5/3) sandy loam, brown (10YR 4/3) moist; massive; hard, very firm, slightly sticky and slightly plastic; few very fine, fine, and medium roots; few very fine tubular pores; slightly effervescent (5 percent calcium carbonate); lime in soft segregated masses; moderately alkaline (pH 8.2); abrupt smooth boundary. (0 to 5 inches thick)
3Bk3--14 to 27 inches; brown (10YR 5/3) silty clay loam, dark grayish brown (10YR 4/2) moist; massive; very hard, very firm, sticky and plastic; few very fine, fine and medium roots; few very fine and fine tubular pores; strongly effervescent (10 percent calcium carbonate); many soft segregated lime masses; moderately alkaline (pH 8.4); abrupt smooth boundary. (0 to 18 inches thick)
3C1--27 to 30 inches; very pale brown (10YR 8/2) silty clay loam, pale brown (10YR 6/3) moist; massive; very hard, extremely firm, sticky and plastic; few very fine and fine roots; few very fine and fine tubular pores; violently effervescent (38 percent calcium carbonate); strongly alkaline (pH 8.6); abrupt smooth boundary. (0 to 5 inches thick)
3C2--30 to 43 inches; brown (7.5YR 5/2) silty clay loam, brown (7.5YR 4/2) moist; massive; very hard, very firm, sticky and plastic; few very fine and fine roots; few very fine and fine tubular pores; strongly effervescent (9 percent calcium carbonate); strongly alkaline (pH 8.6); clear smooth boundary. (10 to 20 inches thick)
4C3--43 to 60 inches; grayish brown (2.5Y 5/2) silty clay, grayish brown (2.5Y 5/2) moist; massive; hard, very firm, very sticky and very plastic; few very fine and fine roots; few very fine and fine tubular pores; few lime veins in a noncalcareous matrix; moderately alkaline (pH 8.4).
TYPE LOCATION: About 14 miles northwest of Buhl, Twin Falls County, Idaho; in the northeast 1/4, northeast 1/4, southeast 1/4 of section 18, T. 8 S., R. 13 E.
RANGE IN CHARACTERISTICS:
Hard lacustrine sediments - less than 20 inches
Depth to bedrock - 60 inches or more
Control section averages
Texture - SIL or SICL
Clay content (control section average)- 25 to 34 percent
Reaction - moderately alkaline or strongly alkaline
Calcium carbonate - 5 to 40 percent
Average annual soil temperature - 50 to 54 degrees F.
A horizon
Value - 6 or 7 dry, 3 through 6 moist
Chroma - 2 through 4 dry or moist
Structure - granular or platy
2Bk, 3Bk, and 3C horizons (hard, firm, or very firm lacustrine sediments)
Hue - 10YR, 7.5YR, or 2.5Y
Value - 5 through 8 dry, 4 through 6 moist
Chroma - 2 through 4 dry or moist
Textures - L, SL, SIL, SICL, or SIC
COMPETING SERIES: These are the Calcross (T), Jigsaw (T) and Manassa soils. Calcross and Jigsaw soils lack lacustrine sediments in the profile. Calcross soils have C horizons with hues of 2.5YR or 5YR and lack calcic horizons. Manassa soils have an exchangeable sodium percentage of more than 15 percent above a depth of 20 inches and more than 40 percent below.
GEOGRAPHIC SETTING: Kudlac soils are on terraces and breaks. The slope ranges from 4 to 60 percent. The soils formed in lacustrine sediments from mixed sources. Elevations are 2,700 to 3,500 feet. The average annual precipitation ranges from 8 to 10 inches. The average annual temperature is 49 to 52 degrees F. The frost free season is 120 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Owsel, Paniogue, Purdam, and Taunton soils. Owsel, Paniogue, Purdam, and Taunton soils occur on higher terraces. Owsel and Purdam soils have argillic horizons. Paniogue soils are 20 to 40 inches deep to sand and gravel. Taunton soils are 20 to 40 inches deep to a hardpan.
DRAINAGE AND PERMEABILITY: Well drained, rapid runoff; very slow permeability.
USE AND VEGETATION: Kudlac soils are used for rangeland. Native vegetation is Thurber needlegrass, basin wildrye, and Wyoming big sagebrush.
DISTRIBUTION AND EXTENT: Kudlac soils are of small extent in south central Idaho, and used in Central Utah; MLRA 28A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Twin Falls County, Idaho, 1992.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 7 inches (A1 and A2 horizons)